[Home Theater Network HDAV.com.cn] If the AV amplifier is the heart of the home theater, then the AV speaker is the mouthpiece of the home theater. Home theaters need to reproduce the ambient sound effects in the film. There are more speakers. In principle, speakers of any shape, size and style can be used. However, in order to get the best surround sound effect, it is necessary to understand the performance requirements of the home theater. Just as high-fidelity stereos have the same performance requirements for hi-fi speakers, the performance requirements between the two speakers are different.
Different requirements for performance indicators
AV speakers have higher sensitivity requirements, mainly because of the higher average sound pressure required when watching TV programs. Hi-Fi (high-fidelity) speakers are mostly low-sensitivity speakers, making it difficult to achieve the powerful sound required by AV systems. The pressure level is prone to clipping distortion when re-amplifying the dynamic signal. Therefore, AV speakers should be more sensitive than high-fidelity speakers.
AV speakers have higher frequency response range, dynamic range and transient response requirements than high-fidelity speakers. Because AV speakers must take into account three aspects of vocals, music and effects sounds, so the frequency response of AV speakers should be wide, the power should be large, and the medium and low frequencies should have better density. This requirement for high-fidelity speakers is lower.
AV speakers require higher dynamic playback for subwoofers than high-fidelity speakers, because of the roar of explosions, thunder, percussion, etc. in nature, the frequency is usually below 60Hz (minimum below 20Hz) and carries huge energy (The maximum sound pressure level can exceed 110dB). If you use high-fidelity speakers to restore them, it will be boring and lacking in shock. In order to solve this problem, the AV sound system uses a subwoofer, so that the main speaker can be smaller in size, which is beneficial to improve the sound image localization and transient response of the system.
AV speakers require no Hi-Fi speakers for fidelity. Because pure music appreciation is more about the sound quality and the sweetness of the sound than watching movies. In terms of vocal dialogue, music and effect sound, music has the highest requirements for fidelity, and people pay attention to the visual and linguistic dialogue when watching movies, and are not very concerned about the details of music. Therefore, the AV speaker does not overemphasize the details of the sound performance, but look at the performance of the performance of the big dynamic, to enhance the atmosphere, with the sound field positioning of the picture, to create a regrettable scene.
Different requirements for the performance of the tone
High-fidelity speakers focus on the perfect reproduction of music, while AV speakers focus on the perfect reproduction of vocal and environmental effects, and the quality of music is not high. High-fidelity speakers focus on the tone style, emphasizing the musical charm, focusing on the ability to express minor details, requiring the use of softer and more delicate speakers. The AV speaker pays attention to the momentum and strength of the sound, so as to produce a more shocking effect. At the same time, the speaker is required to have a strong control of the sound and a good sense of speed. From whispering to lightning and thunder, it is instantly and freely retractable. High-fidelity speakers are typical of British-made speakers, and AV speakers are typically represented by American-made speakers. Because the United States is the most developed country in the world's film industry, such as sound movies, stereo movies, Dolby Surround, THX systems, Dolby AC-3 systems, etc. are from the United States. Moreover, the speakers produced in the United States are dynamic and full of momentum, and the sound is tense and exciting. Therefore, American-made speakers are most suitable as AV speakers. If you want the characteristics of AV speakers and the characteristics of Hi-Fi speakers, you can use Nordic-style speakers, such as German and Danish speakers, the speaker is neutral, which can not only show the strength of American speakers, but also have The softness of British speakers.
Different requirements for the anti-magnetic performance and distribution of the speaker
AV system (home theater audio and video system), not only must have a strong sound, but also have a moving picture, must have a sound, so it must be compatible with the TV, especially the center speaker should be close to the TV, TV The machine itself is magnetic, so the anti-magnetic performance must be considered for the speaker. The high-fidelity speaker is just pure music appreciation, so the anti-magnetic performance requirements are slightly lower. The distribution of AV speakers is generally colored with the “three small†distribution scheme in front, the left and right main speakers, the center speaker are arranged in a shape, and the rear auxiliary speakers (surround) The height of the speaker is higher than that of the main speaker, and it is placed in a figure eight shape (900 to 120 degrees). Avoid producing a sound image on the head or at the back of the head. The subwoofer placement does not affect the positioning of the sound image group, and does not affect the sound field loudness. The subwoofer is generally placed under the main speaker. The hi-fi speakers are slightly wider, mainly based on room acoustic conditions, sound field distribution, and the main radio zone. More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
Note: This article was transferred from the Xiamen Advanced Audiovisual Exhibition. The article is an independent view of the author and does not represent the position of the home theater network.
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